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Finding the Fourth Proportional to 85,611.63, 128,243.37 and 69,872.75

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Solution

The fourth proportional to 85,611.63, 128,243.37 and 69,872.75 is: 104,667.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,611.63 : 128,243.37 = 69,872.75 : x
  2. Step 2: Convert to fraction form
    85,611.63/128,243.37 = 69,872.75/x
  3. Step 3: Cross multiply
    85,611.63x = 128,243.37 × 69,872.75
  4. Step 4: Simplify right side
    85,611.63x = 8,960,716,581.80
  5. Step 5: Solve for x
    x = 8,960,716,581.80/85,611.63
  6. Step 6: Final answer
    x = 104,667.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.